我們先說(shuō)離網(wǎng)逆變器。

首先逆變器是啥，電池的電是直流電能，需要轉(zhuǎn)化成定頻定壓或調(diào)頻調(diào)壓的交流電 ，才能供負(fù)載使用，尤其是供一般家用負(fù)載使用。

這時(shí)就需要一個(gè)轉(zhuǎn)化器，這個(gè)轉(zhuǎn)化器就叫逆變器。如果是反向轉(zhuǎn)化，由交流電變成直流電，則叫整流器。

離網(wǎng)系統(tǒng)基本都是直流變交流，所以逆變器是整套系統(tǒng)的核心中的核心。

逆變器分并網(wǎng)逆變器，離網(wǎng)逆變器，和并離網(wǎng)逆變器三種

1.并網(wǎng)逆變器：是能把光伏發(fā)出的電，并進(jìn)市電，但是離網(wǎng)系統(tǒng)輸出是不需要將發(fā)出來(lái)的電并入市電電網(wǎng)，基本是自產(chǎn)自銷供給本地負(fù)載使用，所以做離網(wǎng)系統(tǒng)，不考慮選購(gòu)并網(wǎng)逆變器。

2.離網(wǎng)逆變器則是沒有市電電網(wǎng)并入功能，只服務(wù)離網(wǎng)發(fā)電系統(tǒng)，實(shí)現(xiàn)分布式發(fā)電的自產(chǎn)自用。

3.并離網(wǎng)逆變器則是兩個(gè)功能都具備，如果你這邊的離網(wǎng)系統(tǒng)，在自產(chǎn)自用之余，未來(lái)有并網(wǎng)需求的可能，則可以考慮選這個(gè)，為未來(lái)并網(wǎng)做預(yù)留。這個(gè)一般更適用于大型離網(wǎng)發(fā)電系統(tǒng)，存在發(fā)電過(guò)多用不完并到市電的可能。

但是并離網(wǎng)逆變器比較貴，如果你的離網(wǎng)系統(tǒng)完全沒有并網(wǎng)需求，完全就是給特定負(fù)載使用，那就還是選純粹的離網(wǎng)逆變器更劃算，一般適用于中小型的離網(wǎng)系統(tǒng)。

Off-grid inverter

Let's start with the off-grid inverter.

First of all, what is the inverter, the battery electricity is direct current, need to be converted into constant frequency voltage or frequency modulation voltage alternating current, to be used for the load, especially for the use of general household load.

Then you need a converter, the converter is called the inverter. If it is a reverse conversion, from AC to DC, it is called a rectifier.

Off-grid systems are basically DC alternating current, so the inverter is the core of the whole system core.

Inverters are divided into grid-connected inverters, off-grid inverters, and off-grid inverters

1. Grid-connected inverter: can put the photovoltaic power, and the mains power, but the off-grid system output is not required to send out the electricity into the mains power grid, is basically self-produced and self-sold to local load use, so do not consider the off-grid system, the purchase of grid-connected inverter.

2. The off-grid inverter only serves the off-grid power generation system without the function of integrating the mains power grid, so as to realize self-production and self-use of distributed power generation.

3. And the off-grid inverter is equipped with both functions. If the off-grid system on your side has the possibility of grid connection in the future, besides its own production and use, you can consider choosing this one to reserve for future grid connection. This is generally more suitable for large off-grid power generation systems, there is too much power generation and to the mains may be.

But the off-grid inverter is more expensive, if your off-grid system has no grid-connected needs, is completely used for specific load, it is still more cost-effective to choose pure off-grid inverter, generally suitable for small and medium-sized off-grid system.